Money = input("请输入带有符号的货币面值：")
if Money[0] in ['C','c']:
 U = eval(Money[3:])/6.78
 print("转换后的货币面值是USD{:.2f}".format(U))
elif Money[0] in ['U','u']:
 C = 6.78*eval(Money[3:])
 print("转换后的货币面值是CNY{:.2f}".format(C))
else :
  print("输入格式错误")